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Thanks in the past for all of the wonderful information posted on these forums.

My 91 525I is running rough and I am not sure if it is because I used a premium non-brand gas. I since bought some premium Chevron to see if that will help improve the performance.

Car has almost 230,000 miles so am looking for hopefully inexpensive fixes and DIY troubleshooting I can check out. Might add I am a non mechanic but would like to try to know what I am looking at for possible repairs before I take it into a BMW mechanic.